6031. The most serious disadvantage of an orificemeter is that
It is not very accurate
It is very costly
Most of the pressure drop is not recoverable
It is not suitable for measuring gas flow
✅ The correct answer is option C.
Chemical Engineering
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6032. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is
Parabolic
Flat
Flat near the wall and parabolic in the middle
Parabolic near the wall and flat in the middle
✅ The correct answer is option D.
6033. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).
V/Vmax = (x/r)1/7
V/Vmax = (r/x)1/7
V/Vmax = (x.r)1/7
None of these
✅ The correct answer is option A.
6034. Viscosity of water at 40°C lies in the range of
1 x 10⁻³ to 2 x 10⁻³ kg/m.s
0.5 x 10⁻³ to 1 x 10⁻³ kg/m.s
1 to 2 kg/m.s
0.5 to 1 kg/m.s
✅ The correct answer is option B.
6035. Mass velocity is independent of temperature & pressure, when the flow is
Unsteady through unchanged cross-section
Steady through changing cross-section
Steady and the cross-section is unchanged
Unsteady and the cross-section is changed
✅ The correct answer is option C.
6036. Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
Flow rate
Mean velocity
Both A & B
Neither A nor B
✅ The correct answer is option B.
6037. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).
24000
24
0.24
0.44
✅ The correct answer is option D.
6038. N²Re/NFr is called the __________ number.
Brinkman
Galileo
Archimedes
Euler
✅ The correct answer is option B.
6039. The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.
Hyperbola
Parabola
Semi-circle
Semi-ellipse
✅ The correct answer is option B.
6040. Creeping flow around a sphere is defined, when particle Reynolds number is
< 2100
< 0.1
> 2.5
< 500
✅ The correct answer is option B.